package com.whynot.frame.basic.util;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext arg0) throws BeansException {
        if (SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = arg0;
        }
    }

    // 获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    public static void setAppCtx(ApplicationContext webAppCtx) {
		if(webAppCtx == null)
			return;
		applicationContext = webAppCtx;
	}

    // 通过class获取Bean.
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }

    // 通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name, Class<T> clazz) throws ClassNotFoundException{
        return getApplicationContext().getBean(name, clazz);
    }

	/**
	 * 根据beanName(对应于Bean配置的Id属性）获取Bean对象
	 * @param beanName
	 * @return
	 */
	public final static Object getBean(String beanName) {
		return getApplicationContext().getBean(beanName);
	}

	public final static Object getBean(String beanName,String className) throws ClassNotFoundException {
		Class  clz = Class.forName(className);
		return getApplicationContext().getBean(beanName,clz.getClass());
	}

	/**
	 * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
	 *
	 * @param name
	 * @return boolean
	 */
	public static boolean containsBean(String name) {
		return getApplicationContext().containsBean(name);
	}

	/**
	 * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
	 * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
	 *
	 * @param name
	 * @return boolean
	 * @throws NoSuchBeanDefinitionException
	 *
	 */
	public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
		return getApplicationContext().isSingleton(name);
	}

	/**
	 * @param name
	 * @return Class 注册对象的类型
	 * @throws NoSuchBeanDefinitionException
	 *
	 */
	public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
		return getApplicationContext().getType(name);
	}

	/**
	 * 如果给定的bean名字在bean定义中有别名，则返回这些别名
	 *
	 * @param name
	 * @return
	 * @throws NoSuchBeanDefinitionException
	 *
	 */
	public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
		return getApplicationContext().getAliases(name);
	}


}